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Related Concept Videos

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism01:37

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
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Inorganic Nitrogen Assimilation01:22

Inorganic Nitrogen Assimilation

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview01:26

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Overview

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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
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Nitriles to Carboxylic Acids: Hydrolysis01:08

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Nitriles undergo acid-catalyzed hydrolysis or base-catalyzed hydrolysis to form a carboxylic acid. These reactions proceed via an amide intermediate.
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Modeling a Nitrogenase Key Reaction: The N2-Dependent HD Formation by D2/H+ Exchange.

Dieter Sellmann1, Anja Fürsattel1

  • 1Institut für Anorganische Chemie der Universität Erlangen-Nürnberg, Egerlandstrasse 1, D-91058 Erlangen (Germany), Fax: (+49) 9131-852-7367.

Angewandte Chemie (International Ed. in English)
|June 29, 2021
PubMed
Summary

The study reveals how nitrogenase enzymes function by detailing the diazene complex intermediate in nitrogen (N₂) reduction. This finding explains the coupled formation of HD from deuterium and protons, clarifying a long-standing biochemical puzzle.

Keywords:
Homogeneous catalysisNitrogen fixationNitrogenasesReaction mechanismsS ligands

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Area of Science:

  • Biochemistry
  • Enzymology
  • Bioinorganic Chemistry

Background:

  • Nitrogenase enzymes are crucial for biological nitrogen fixation.
  • Understanding the molecular mechanism of nitrogenase, particularly the FeMo cofactor, remains a significant challenge.
  • The N₂-dependent HD formation reaction has been an unexplained phenomenon for decades.

Purpose of the Study:

  • To elucidate the molecular-level function of FeMo nitrogenases.
  • To explain the N₂-dependent HD formation from D₂ and H⁺.
  • To identify the specific N₂-reduction intermediate responsible for coupling N₂ reduction and HD formation.

Main Methods:

  • Investigated the reaction of a diazene complex (1a) with deuterium (D₂).
  • Analyzed the product (1b) and HD formation.
  • Correlated findings with the known properties of FeMo cofactors in nitrogenases.

Main Results:

  • Demonstrated that the diazene complex (1a) reacts with D₂ to yield product (1b) and HD.
  • Established a direct, inseparable coupling between N₂ reduction and HD formation via a specific N₂-reduction intermediate.
  • Provided a mechanistic explanation for the N₂-dependent HD formation.

Conclusions:

  • The diazene complex pathway explains the long-standing enigma of N₂-dependent HD formation.
  • This mechanism offers critical insights into the functioning of FeMo cofactors in nitrogenase enzymes.
  • The findings advance our understanding of biological nitrogen fixation at the molecular level.